Modification of TiO2/AC catalyst for visible light degradation of ionic liquid contaminated wastewater: Effect of Cu loading on the characterization and efficiency

2020 ◽  
Author(s):  
Aina Farwizah Shahhiran ◽  
Raihan Mahirah Ramli ◽  
Azhar Zawawi ◽  
Hayyiratul Fatimah Mohd Zaid ◽  
Noorfidza Yub Harun
Keyword(s):  
Ionic Liquid ◽  
Visible Light ◽  
Visible Light Degradation

scholarly journals CeO2-TiO2 Photocatalyst: Ionic Liquid-Mediated Synthesis, Characterization, and Performance for Diisopropanolamine Visible Light Degradation

2018 ◽  
Vol 13 (1) ◽  
pp. 170 ◽  
Author(s):  
Jagath Retchahan Sivalingam ◽  
Fai Kait Chong ◽  
Cecilia Devi Wilfred
Keyword(s):  
Ionic Liquid ◽  
Visible Light ◽  
Visible Region ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Halogen Lamp ◽  
Tio2 Photocatalyst ◽  
Vis Spectroscopy ◽  
And Performance ◽  
Visible Light Degradation

CeO2-TiO2 photocatalyst with Ce:Ti molar ratio of 1:9 was synthesized via co-precipitation method in the presence of 1-ethyl-3-methyl imidazolium octylsulfate, [EMIM][OctSO4] (CeO2-TiO2-IL). The ionic liquid acts as a templating agent for particle growth. The CeO2-TiO2 and TiO2 photocatalysts were also synthesized without any ionic liquid for comparison. Calcination was conducted on the as-synthesized materials at 400˚C for 2 h. The photocatalysts were characterized using diffuse reflectance UV-Vis spectroscopy (DR-UV-Vis), field emission scanning electron microscopy (FESEM), X-ray powder diffraction (XRD), and surface area and pore size analyzer (SAP). The presence of CeO2 has changed the optical property of TiO2. It has extended the absorption edge of TiO2 from UV to visible region. The calculated band gap energy decreased from 2.82 eV (TiO2) to 2.30 eV (CeO2-TiO2-IL). The FESEM morphology showed that samples forms aggregates and the surface smoothens when ionic liquid was added. The average crystallite size of TiO2, CeO2-TiO2, and CeO2-TiO2-IL were 20.8 nm, 5.5 nm, and 4 nm. In terms of performance, photodegradation of 1000 ppm of diisopropanolamine (DIPA) was conducted in the presence of hydrogen peroxide (H2O2) and visible light irradiation which was provided by a 500 W halogen lamp. The best performance was displayed by CeO2-TiO2-IL calcined at 400˚C. It was able to remove 82.0% DIPA and 54.8% COD after 6 h reaction.  Copyright © 2018 BCREC Group. All rights reservedReceived: 26th July 2017; Revised: 22nd October 2017; Accepted: 29th October 2017; Available online: 22nd January 2018; Published regularly: 2nd April 2018How to Cite: Sivalingam, J.R., Kait, C.F., Wilfred, C.D. (2018). CeO2-TiO2 Photocatalyst: Ionic Liquid-Mediated Synthesis, Characterization, and Performance for Diisopropanolamine Visible Light Degradation. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (1): 170-178 (doi:10.9767/bcrec.13.1.1396.170-178) 

scholarly journals Ionic Liquid-Assisted Synthesis of Ag3PO4 Spheres for Boosting Photodegradation Activity under Visible Light

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 788
Author(s):  
Beibei Zhang ◽  
Lu Zhang ◽  
Yulong Zhang ◽  
Chao Liu ◽  
Jiexiang Xia ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Visible Light ◽  
High Efficiency ◽  
Chemical Precipitation ◽  
Active Species ◽  
Precipitation Method ◽  
Dihydrogen Phosphate ◽  
Xrd Pattern ◽  
Simple Chemical ◽  
Visible Light Driven

In this work, a simple chemical precipitation method was employed to prepare spherical-like Ag3PO4 material (IL-Ag3PO4) with exposed {111} facet in the presence of reactive ionic liquid 1-butyl-3-methylimidazole dihydrogen phosphate ([Omim]H2PO4). The crystal structure, microstructure, optical properties, and visible-light photocatalytic performance of as-prepared materials were studied in detail. The addition of ionic liquids played a crucial role in forming spherical-like morphology of IL-Ag3PO4 sample. Compared with traditional Ag3PO4 material, the intensity ratio of {222}/{200} facets in XRD pattern of IL-Ag3PO4 was significantly enhanced, indicating the main {111} facets exposed on the surface of IL-Ag3PO4 sample. The presence of exposed {111} facet was advantageous for facilitating the charge carrier transfer and separation. The light-harvesting capacity of IL-Ag3PO4 was larger than that of Ag3PO4. The photocatalytic activity of samples was evaluated by degrading rhodamine B (RhB) and p-chlorophenol (4-CP) under visible light. The photodegradation efficiencies of IL-Ag3PO4 were 1.94 and 2.45 times higher than that of Ag3PO4 for RhB and 4-CP removal, respectively, attributing to a synergy from the exposed {111} facet and enhanced photoabsorption. Based on active species capturing experiments, holes (h+), and superoxide radical (•O2−) were the main active species for visible-light-driven RhB photodegradation. This study will provide a promising prospect for designing and synthesizing ionic liquid-assisted photocatalysts with a high efficiency.

scholarly journals Visible Light Catalytic Degradation of Aniline Wastewater over Multishaped BiOBr Microcrystals

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Jun Zhang ◽  
Huabo Li ◽  
Hairui Yao ◽  
Hao Zhang
Keyword(s):  
Ionic Liquid ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Hydrothermal Route ◽  
Degradation Ratio ◽  
Soft Templating ◽  
Different Shapes ◽  
Simulated Wastewater ◽  
Surface Microstructures ◽  
Templating Effect

The photooxidation process of aniline-containing simulated wastewater under visible light irradiation over BiOBr microcrystal grains with different shapes was studied. The distinctive surface microstructures of the BiOBr microcrystals, like clustered flower petals and quadrate lamellas, were produced by using imidazole ionic liquid and inorganic bromide as Br sources and by solvothermal and hydrothermal route, respectively. The ionic liquid not only can impact the products’ morphology, but also can largely improve the photocatalytic activity of the BiOBr microcrystals due to the soft templating effect. The top degradation ratio of the aniline wastewater photocatalyzed by lamellar BiOBr crystals is 23.71%, but the equivalent value photocatalyzed by flower petal-like BiOBr crystals is almost twice as much; that is, it reaches 46.51%. The photodegradation effect and mechanism over differently shaped BiOBr microcrystals have been compared.

NH 2 -MIL-53(Al) nanocrystals anchored on the surface of RGO hollow spheres and its visible light degradation of methylene blue

2017 ◽  
Vol 197 ◽  
pp. 17-20 ◽  
Author(s):  
Yongfang Yang ◽  
Wenjie Wang ◽  
Hua Li ◽  
Xiaoguang Jin ◽  
Hefang Wang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Hollow Spheres ◽  
Visible Light Degradation

Visible-Light Degradation of 2-Chlorophenol by TiO2 doped with Neighboring Transition Metal Cerium via Various Approaches and Operation Parameters

2021 ◽  
Author(s):  
Justin Chun Te Lin ◽  
Nolan C. Tolosa ◽  
Khajornsak Sopajaree ◽  
Anusorn Gongglom ◽  
Thidarat Jitjanesuwan ◽  
...  
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Lower Energy ◽  
Critical Parameter ◽  
Operational Conditions ◽  
Calcination Temperatures ◽  
Initial Ph ◽  
Operation Parameters ◽  
Visible Light Degradation ◽  
In The Beginning

Abstract TiO2-related materials or processes for 2-chlorophenol (2-CP) degradation either under UV or visible light irradiations with key operational conditions was systematically reviewed in the beginning of this study. Cerium (Ce), which was neighboring transition metal elements of titanium (Ti), were individually doped with TiO2 via various methods. Three synthetic parameters in the two approaches were examined their significance by using experimental designs. It was found that the 2-CP can be 100% removal within 4-h irradiation by visible light in the synthetic condition of 0.35 mol.% Ce, 0.15 vol.% nitric acid and calcined at 600oC. Moreover, effects of three operation parameters of the as-prepared catalysts were further investigated. The most efficient condition obtained was 3 g·L− 1 catalysts at initial pH and 2-CP concentration of 7 and 10 mg·L− 1, respectively. A critical parameter, pHpzc of undoped and Ce-doped TiO2, were also determined. In addition, surface area, pore volume and size of both TiO2–based catalysts were found affected by the calcination temperatures and consequently degradation efficiency. The presenting results and mini-review were facilitated the development and applications of TiO2 in the degradation of 2-CP under lower energy radiations.

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